#pragma once

#include "../crow/utility.h"
#include "../crow/http_request.h"
#include "../crow/http_response.h"

namespace crow {
namespace detail {

template<typename ... Middlewares>
struct partial_context: public black_magic::pop_back<Middlewares...>::template rebind<partial_context>,
public black_magic::last_element_type<Middlewares...>::type::context {
    using parent_context = typename black_magic::pop_back<Middlewares...>::template rebind<::crow::detail::partial_context>;
    template<int N>
    using partial = typename std::conditional<N == sizeof...(Middlewares)-1, partial_context, typename parent_context::template partial<N>>::type;

    template<typename T>
    typename T::context& get() {
        return static_cast<typename T::context&>(*this);
    }
};

template<>
struct partial_context<> {
    template<int>
    using partial = partial_context;
};

template<int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares>
bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);

template<typename ... Middlewares>
struct context: private partial_context<Middlewares...>
//struct context : private Middlewares::context... // simple but less type-safe
{
    template<int N, typename Context, typename Container>
    friend typename std::enable_if<(N == 0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req,
                                                                              response& res);
    template<int N, typename Context, typename Container>
    friend typename std::enable_if<(N > 0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req,
                                                                             response& res);

    template<int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares2>
    friend bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);

    template<typename T>
    typename T::context& get() {
        return static_cast<typename T::context&>(*this);
    }

    template<int N>
    using partial = typename partial_context<Middlewares...>::template partial<N>;
};

}
}

